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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e769ef0c1ad07166d93b48f0b38c66f4fb268ee02df357aea30c797f8a796d5' 
  AND token = 'l8+/NvlLPcobqcXkC3zFjyk9vRxQ4C2Bja5SCpBOmIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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