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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d51d43bb96fe8f52a25761d2edc869cdc54fc215680460157ccc234eb62794' 
  AND token = '24Vss422KuSm07ecB/5Io2NO+oaiia4styDurqBb0vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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