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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a944a5d73ef225bc2adb880593737a801bcbc6bec41c779d6346d1c7c57f1b75' 
  AND token = '0R1+lJmDRlcBenYuygl7TBFEm5YElvU1Ma7hI+LDxTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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