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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10f5f6f3c7720667711361e32706c7cb0219aec05d60a579ffbadb5d83a64693' 
  AND token = 'QRpBMvcZe4rAd8871CJusnHKsGhzjevkn9jl7phemMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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