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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baab2472a8580d79a2185b28205df743cf2c4785e3d5b84c9dd9c07f38809b6d' 
  AND token = '5yU7pWX0Ck7CdUQdjEpPjB5H8tr8OHtlvs5iDbT2xI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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