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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4cc8d4972e271a649a84e77cab5fb707b59d1f9ad7cbe835d75e3fa22fb39c7' 
  AND token = 'FD1O7OmYl9Yn9FRLHHPKKqbqI7ggbo/TZ0VFO8MJ7ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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