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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c86cade19a168a7684a1106f57780a68dc268679ba0ee92de4d7b83c0c22aa7' 
  AND token = 'N3zxl8qHIZzB7foutqd3fRSUqFcHGV5ET4Aox17k+EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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