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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87896fe55c96499f2a88e7984c13d1b7cb180a4708cad48ac281e8619dcaa20' 
  AND token = '+ajW/cN4uc4tEsxMVcPQZ1jcwqDxVbePvoD/BNJOWxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00429

JSON explain

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