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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f954ecfd6556bf5cb29e77caca1aeebd6f647dbaaab3bf32a0e7c085b6de77d' 
  AND token = 'WayAezaOG4Qe2yhFszLhr9mOBRHXfMxoGstETyXIpxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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