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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f503d4d93452efe7e91a39a51df1428c7a8c5fb658505d6ac83b5786ed2632b' 
  AND token = '/8x8ZEQ0IQ7H+cU3O4e58T7/xd82Q2/FsrWEyPeEBcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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