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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2960a8a45c91e9fa143f4334e349a97d47d4d6af092cb3b8f47336279d4ef31' 
  AND token = 'yhjEOJGGiK5a7FZUY9hTBbfgteK78tomvGP4tner+bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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