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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a58e3658078e8a27ded876d8c33b7ae63fe294f6c72dc875f417af7cfcc34d26' 
  AND token = 'h2b8y4rDM2vajGIHkCudVs67dt0lSS60G10CTmFsB0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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