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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f7cdaacdc50e9c2965c1ded854d99b0b354f47e35c94f88e7fb43c98032c6bd' 
  AND token = 'K3bFhXQVx4Ecaiy4C7KvEDkj+AQ+s63bcVBEveW93rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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