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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4745da8d92c8c932d58dca20e16661cbc622407c1f56b54f9b0b4df56cd7934' 
  AND token = 'CZalKH/2krSdjnT3EXPUEid6ji9IYsXHtAELTNaS4FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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