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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5336b161f452591ebc67de9b65f20d206d23866ade5b0b959eac2ec0c77ae99d' 
  AND token = 'IOk7CIhi2iA4rsPZlmy3ywYHarm/Kx247ILmdsojhmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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