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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f184ca2dc17511477c0e547b362e592bd7223fa1aeabf3c6cc52041d9b0a8c' 
  AND token = 'jhEzf+FKdScRhRnpi9jIeT0Bgs64OomSbc8uRWKUaaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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