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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08de92e7d35e6fe87dd336f6e2ec289916a3a95094fb2744be6b8700804e1f0' 
  AND token = 'QZTs86R0Hx9JRX5THuaMfXETcygSbjLAhGd7952Sf28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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