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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb3fad682e2610d838d46e1644f3ed32f5faee322f3f710c16bef1eb2543a62' 
  AND token = 'Ndtfw2w2c2qZNg4IowLMx/YRcbSjXjtaTy7NjR1qNPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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