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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e02cfdcf7a590647ad036e16730efa6928ff5c47990be6697cc61d346e0c72' 
  AND token = '1uW1LU2SOerqah8W+H68vz48CLEakg5/eBvcndEQs/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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