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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3768e8ff98b26d0d818a61576c211409677ddb8caddca5f8ff7d27b7008d8990' 
  AND token = 'evjw5h4/l2Rp4y5TInkF1c8PcElKPsLTrIiJxIaxa5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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