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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7360675bfb2db6a5931fc2dfb809c66183237da00f2d5f2aeea639c97be26dff' 
  AND token = 'kYbgF7eC7i1WaXLpq8C+VARbgOd5d0qbPdSEKMhLdcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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