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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a23c3803ba4a71ac6d4d380499d061c1701e498034c931eb53058923f4cea0e' 
  AND token = '5aVe1GZPqsZ1DlqTCfIlrhsliQ/8VLcTjCSBdh7R2Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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