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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2786fa3946f9822be838a2e85fbb2558483e430abb26094da65bcaca557a6c3c' 
  AND token = '2HemzBvRNTbeAnW6SWosQ+EDKaUg3gGz60jAL1qtQyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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