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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61675c3b1d3bc51612fe8c3e00ff0efbbd3c3f4db296c1edbdf9d8955ac923dd' 
  AND token = 'yqqFgOT5/y9cOSttOeE6OMRN5J0EiXnlkrGZPzhKfYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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