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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d83627ea05e7825a0d6a6d28a698be48ab17dd5718f652ccf41bd9d243a9dc' 
  AND token = 'HCwHTJvqM8KHtlbc3b3yNeCaheg76IOC5n7vjX0WMfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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