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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db82c6a22b62ed86cfd830e9282afd7fd3e6a49e9ea5e4092a0c1455c79c419' 
  AND token = 'P3obGSpt8C1nMV8VlLF8FGS9J/nM0lN177oPYulVXJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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