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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e115290c9b498bae3691ce8842d711bacaa5cad03707be882143a947002892' 
  AND token = '9tooMvY+Mh86tDOzJ02vON1JgJ4NF5zt/1GTiMMS7bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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