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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6969b88b211d53dc11623284687a3e1e0b122c7909576cf6e81b8b2b3fbee8ac' 
  AND token = 'jo9K47txxWoKx9kxomhFrroy0nVvQPF5TiZPHq2roCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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