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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abec283f5585e46ddbbd9b5b8c25274b79eebd64d5b182f9fa146f80f4b6f0e5' 
  AND token = 'X4lPQUrcbw8l0SLtS+rc7JuH9qqVQ3W2fpecDICxdfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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