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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2083d84650c7b443c0a16a488fa49fcfcf7bb1ba63f0a2947a4bc168bbb038f' 
  AND token = 'NF+sBTJVvOfp8dbZ53slIKIWENBHMpt4FQrsiStuiiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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