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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99cb82d5dafc41c932be6f034ebff9923de384fb20dc38b591c0e811382acef4' 
  AND token = 'ANwFXgpe/Dk90mgGUHR6RD9xKH7p3Ci8OiPrJRIY1JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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