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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dff18ab5da1ca7a6c0a46ffe89c66cb23cf7ae7f05d3986f24c2143725f6851' 
  AND token = '9ADgsdY36r6xZqGESESbPZ+NnmnvRMSbC36FHVX9Xtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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