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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde0e50eccdae3d33eb52fa13b0acfa948d65490eb5fe262d860c484fa2e60f7' 
  AND token = 'QW4GowWqdW4BU8/pDnuJCcPDJfYynQc2rQXIm5zLaGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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