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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce996ff8c169399e9b728aed999f8331191a33fd6ddcb33174a2918d9c5bbc5' 
  AND token = 'dw+ABvxC3Xkz+SXOR9mdkMvnH4RC1qB4o8IWFc44RS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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