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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f85b4468c255f83841907e0b56798c6e9f8d7deab2fd02ce05a4ce752aadd63' 
  AND token = '+fNqaPYtMs+m2LJw3sBdHfwHfqhd1D+fUbqYkgdj7Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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