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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbcbdbdae6a95e5d387225e1c33db0c0ad157aead6e9768a62e5bfe66f3f7dc6' 
  AND token = 'e4hoh89IdKc2ak5Pmz0TPVi/ckgj9AcbQXAvdZWsGus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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