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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6951c8aca3bda4fc1cdb079d72fb4fcbf3a41bb616f6f8a4cafa08834e86215' 
  AND token = 'lX9Ca7OcbQpqX5j8e8W/bq/Xxw+5cA1pDO5lUagXfr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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