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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c36c2071effc412a3f674b0b3ce4539997a6c354ca3abc647d3f0e7ea8b315' 
  AND token = 'Bg6FZL3JQ9YdsHxlNRQDQGp7NoFGJajIhZyWHNcZvqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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