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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840828bc76bd0ab9eeddfe0789929c8571488076ec387f4447111bf741d3beb6' 
  AND token = 'cTP5fhahvzl04+AddHNmp1b88zx+Kqpadms6kDkrDjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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