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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b732555de4790d60a69d01bac9a4a8840e13141d2c824d946d33cf8ed98c20f5' 
  AND token = 'ZoZN+NM9DizbI3HcV6ZjkQHV0/S9d+kEnwC7MalVbdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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