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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '279383443f42fa708d3aeb11a3373c893d9342c5435ff53ac91d964a3a79a10f' 
  AND token = 'iR5a71IX4vLV5G6PFuRygl5nrs4A1MMYTax5/iivqeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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