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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f3049e1f3eea4eed758284082568b0970491116696f2feede499ab983f6ec6' 
  AND token = 'yNVE5krXHM28qjTkPq9YK2j9Fcs8pVPJyJo6x5/ikkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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