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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aff6d5150cfd9b4ff94a0afbbe8b5e6082a43543a5370e357177937217ec7ac' 
  AND token = 'Ftkacf+goeBQS+HnpkI+TJUHg2RBxd48DZ9CVryzmoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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