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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc83a83b0ac391da3e57ef211ce69af503415fbedc0a056d7c01b278529a9bf' 
  AND token = 'BykVst0TsTkLl9PSaKs3mKYnMbmjCvnR03BHl070cuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}