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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22831bffb02394e9554c0b9ca4cfbec006d99f84c8a1649a09c6108d52460dad' 
  AND token = 'kZIK7M4JF4zdCSKaa3VHW+EQK17tsx9RUGRbEqdkmj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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