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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce45f87112f05a7733fd7dd08d2a58ed0d85ff33cb97bd3ee7040baa5ea5f439' 
  AND token = '4W+d9nsz1alvlJDoPet99Vd56lDl+e2hvq3OB+/mdJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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