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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9975a7174b34cfa26f08fb27ffd17957d76ebce5fc4b51261c78143ebe550a9e' 
  AND token = '12YDPOy5VE483rwba9OcjHCo3CcV+mcPxltNUeCHvzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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