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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac54df36d7efcfbe8c053281bd559e15f41a71f0db5e28044b704392fff2aa2' 
  AND token = '+ViE0DSM80Yb/pWw0gQl0dV9lSoyVABG68lxc7GeEWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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