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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0cba583bdedbcf45550ef92a4259325c107edcacbf4dfb4b2a5c0d96aab8b56' 
  AND token = 'YiR4H1PCAGYf3TejYzKr4PXOCZ1LoQwEJOdwO4rJmCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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