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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c706b781f4d651071cf8dbb316ecb5fb1bc1e1efb0201864bcd092554a2911f' 
  AND token = '/U1IHYFX5a9sX8OfemBlPy3jTVLF6H43Xk1+cjYVePw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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