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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf06341c4edf82f27ca5b0c956b2bc680f7efe37fdefea77866e960b90d418d' 
  AND token = 'pvi5WR3GVW1HmTTO5KEtpzQvlgk0u0r6qoiJFnYgoGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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