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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00107ba88b39230b6b938d02dc38bf182b373df0860d110b17a91b3b79dd76f' 
  AND token = 'CszskIO+fJnn8l+gwYtrell7rBeAc/j7t9h+LSIykyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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