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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dc443f468082bc153c515d3871f7cd05f5d7b3715d32a2630e09b5d17ec67f8' 
  AND token = 'Zd92kH1GDF5sJiQJGeNYnN1LdfybqLS7vFExmKnDKLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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