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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59362d7e9e1f170b5920e7c7ece70e9c88c41655d5a5f14b5bb6a33c42421b6e' 
  AND token = 'dl8VsJv642V8KwWOnVVEbM6TylyVcy0PoVQdTG7voGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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