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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dac2fbca58461d7974e124cc594295ec4779e702f1018d5fde915e07433b1de' 
  AND token = 'jSNHeLaTzh7zxywPzi+f+EN2/KJ/p7nXTFof+K3b784=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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