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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974a0528e6586abb9c0ee437de5cdde491e48fdd9cca3bba6f90daa610c3bf32' 
  AND token = '1yqN2eLV1Whf/L6pYjdb2UUj38vFqTUc6r4o9ZEW4G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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