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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a76991bf5b8c6ca35314bcfb58b523c37c344b086caa0d7053ae9ee23e2d6cc' 
  AND token = 'rwrg0/QyOWxty7qj7nyC8z+iEMMSl3GdpoxvVqpnpFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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