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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60cd55df838a0ec920cca47163b4ed8f89b771b649395aa8a48093e565da804e' 
  AND token = 'V34lJ6JidSGXyKYQWv32unyvgZ1z/2eX3hadn9D7tEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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