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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7f91d550774e47ef0b9b9862e7ab82687f33c36432924023592e53d3946e9e' 
  AND token = 'sz9Nf3tGYOYYiqvYu7iKs93wZowio6Fmkb0eMhBkIyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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