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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a27fe47e49ddb012c69696e239f2b8320ad7ec6ff241519523e55af9aedb1c66' 
  AND token = 'Plj8C/albNi4MacaA7F6ark1vaq/OflY+/VTf1W/rww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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