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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '867926837ec52dda328825ff586af3b6202d3588388f07eadd80aa4bd4dada36' 
  AND token = 'XOuZkXk6JHW5k/Rhm/CIyr28UBhXZqwOeHViFVoOMTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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