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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5d7af1bbdf3f9a0287d14912be33a741afc9eec6ee17874178aec8fd240e07' 
  AND token = '0SinjLhBzrQbbPMGBMkkyvSvjTfwaqCWjLNGazhAvHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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